Season 6, episode 7.
Original air date: 1 January 1956.
Cast: Jack Benny (Jack Benny/ The Old Year), Don Wilson (Don Wilson/ Uncle Sam), Red Sanders (Himself- UCLA Football Coach), Duffy Daugherty (Himself- Michigan State Football Coach), The Sportsmen Quartet (Themselves - Singers), Lois Corbett (Lois Wilson - Columbia), Mel Blanc (Airplane/ Mars), Charles Herbert (The New Year), Gene Twambley (Himself - Sound Man), Gurney Bell (Member - The Sportsman Quartet: uncredited), Bill Days (Member - The Sportsman Quartet: uncredited), Robert Garsen (Member - The Sportsman Quartet: uncredited), Benny Rubin (Audience Member: uncredited), Martin Sperzel (Member - The Spotsman Quartet: uncredited).
From IMDB.

Another great show by Jack Benny, who had the best delivery of any comedian ever, and his ability to laugh at himself was terrific,also love how they would take an act by the Sportsmen and turn into a commercial, something youd never see today!

My young teenaged son saw Jack Benny a couple of years ago for the first time. He sat and marveled at, as he put it, a man in a business suit who looked like a banker or businessman, who just stand there and make you laugh. I explained to him that Jack Benny and people like him knew what they were doing and needed no gimmicks like the lessers of today.